Welcome to Sunday! The top five stories on our website this week are displayed below.

Friday marked the two-year anniversary of the World Health Organization’s declaration of the coronavirus.

I remember sitting in a crowded cafe near Boston University two months earlier while editing one of the first articles we published on the topic. I was struggling with unfamiliar terms like “novel coronavirus” and double-checking the spelling of “Wuhan.” Even then, the story felt important and a little frightening, yet few could have predicted the power the virus that causes COVID-19 would have to change the world over the next 24 months.

Our team learned along with our readers as we worked with experts to explain emerging science related to the virus and related topics like mRNA technology, Zoom fatigue, the fragility of global supply chains and the importance of grief and joy.

In the past two years, The Conversation’s global network has produced 11,523 articles about the coronavirus. Of those, 1,599 originated with our U.S. newsroom of about 15 editors.

Picking just one piece from that ocean of content is impossible, but I would like to share one of our early pieces – published just two weeks after the discovery of COVID-19 and five weeks before that WHO pandemic declaration. In it, Maciej F. Boni, a Penn State biologist, clearly assesses the scant evidence available that that early stage and poses questions that are still with us today, like: “How much effort should public health officials put into containment, quarantine and isolation activities?”

Emily Costello

Managing Editor

Putin has kept most oligarchs at a distance – literally and figuratively. Alexey Nikolsky/Sputnik/AFP via Getty Images

Meet Russia’s oligarchs, a group of men who won’t be toppling Putin anytime soon

Stanislav Markus, University of South Carolina

An expert on oligarchs explains how they came to be Russia’s richest and most powerful people and scrutinizes their relationship with Putin.

Memorial tanks at the Ukrainian Motherland Monument in Kyiv. Madeleine Kelly/SOPA Images/LightRocket via Getty Images

Why did Russia invade Ukraine?

Kathryn David, Vanderbilt University

Who are the Ukrainians and when were they part of the same empire as Russia? A scholar answers basic questions on war in Ukraine.

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